There isn’t a single US president in living memory without a litany of war crimes on their head, and probably going back further but I don’t particularly feel like going back to pre-WWII history because just why bother at this point?
Jimmy Carter was good at lip-service, not in reality. And honestly, I don’t even think it’s because he was a particularly nasty person - although I wouldn’t be surprised, he was a politician - it’s just the job forces you to become a war criminal. That’s what happens when you volunteer to supervise the war crimes factory.
EDIT: Actually, if you want to go back further, read one of the US military’s most decorated generals on what the military’s true purpose is, written in the interwar period: archive.org/details/WarIsARacket
Edit 2: before anyone else wants to pile on this and call it all bullshit because they read one item and it wasn’t genocidal enough for them, at least read as far as East Timor, 1977. The list is chronological, if you get bored after the first item I’m sorry, but I’m not spoon-feeding you the whole article.